[Amps] FL2100Z Low power on 160meter band

[Kees - pa7two]

Hi all, 

Rebuilding my Yaesu FL2100Z which burned-out almost completely by a previous owner, I have the unit up & running after noumerous repairs. From bandwafer switch till the majority of the CAPs and build-in all the modifications as listed on the Internet. On the bandwaferswitch the 160 meterband contacts were burned out!

Now, I am facing a 450 watts output only on 160meterband while all other bands do at least 550. 
I also see some red coloring happen on the (Chinese brand) 572b tubes by full output.  
I replaced C35 from the fitted 365pf to a newly fitted 320 pf. (Note: C35 is in the schematic 250pf !?!?) 
Now I have a PLATE setting of 6 and a LOAD setting of 3 on 160m using a 1000 watt spinner dummyload 50ohm. (Before I swapped the C35 I had a PLATE setting of more than 10 and LOAD of 8)

Who can indictate to me were to look? Or....is the lower output absolutely normal on the Yaesu FL2100Z amplifiers? I would expect a higher output compared to the higher frequencies?


Vy 73, de Kees   pa7two at amsat . org

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